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Real-time measurement of mixing ratio of refrigerant/refrigeration oil mixture.

Author(s) : FUKUTA M., YANAGISAWA T., SHIMASAKI M., et al.

Type of article: Article, IJR article

Summary

The mixing of refrigeration oil with refrigerant in a refrigeration cycle has great influence on cycle performance. A sampling method is the most general way to measure the mixing ratio of refrigerant and refrigeration oil. Since the sampling method is time-consuming and reduces the amount of refrigerant and oil in the cycle, a real-time measurement is desirable. In this study, a refractive index measurement was applied to measure the mixing ratio of refrigerant/oil mixture. A laser displacement sensor was used to detect any change in optical path which results from changes of the refractive index of refrigerant/oil mixture. For the practical application of real-time measurement of the oil circulation ratio (OCR) in the refrigeration cycle, a correlation between the refractive index and the mixing ratio was developed. In addition, the changes of the refractive index in a range of a few percentages of the oil concentration and under subcooled conditions were measured. Finally, a transient measurement of the OCR in a practically operating refrigeration cycle was carried out successfully.

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Pages: 1058-1065

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Details

  • Original title: Real-time measurement of mixing ratio of refrigerant/refrigeration oil mixture.
  • Record ID : 2006-2230
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 29 - n. 7
  • Publication date: 2006/11

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